55
Troubleshooting
The compressors make sounds but cannot be started
Possible Cause Handling Method
(1) The compressor voltage is
too low.
Inspect the following items:
a. Certain fuse is blown out.
b. The supply voltage is too low.
c. The electromagnetic contactor of the compressor is faulty.
d. The wire connection is loose.
(2) The compressor is faulty.
Inspect the following items:
a. The motor winding is open-circuited.
b. The current of each phase is too high.
(3) The starting voltage is
insufficient (for the single-phase
unit).
Inspect the following items:
a. The starting capacitor is poor.
b. The starting relay is poor.
The second compressor cannot be started
Possible Cause Handling Method
(1) There is no refrigeration or
heating signal.
Inspect the following items:
a. The temperature switch is damaged.
b. The control wire current is possible improper.
(2) The microcomputer has
no compressor control signal
output.
See the item (3) in Section A
(3) The electromagnetic switch of
the compressor does not excite.
See the item (4) in Section A
The operating period of the compressor is too short
Possible Cause Handling Method
(1) Intermittent connection of
control circuit
Inspect the following items:
a. The contact of the contactor is poor.
b. The wire connection is loose.
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